Desulfurization of dry gas and liquefied gas

The hydrogen content in catalytic dry gas ranges from 35% to 40% (by volume), while the methane content is relatively low; it can be fed directly into a PSA unit for hydrogen recovery or for the production of C1/C2 compounds. In contrast, coking dry gas contains only about 10% hydrogen and a high amount of methane, making it suitable for conversion into hydrogen. There is little difference between the four gas desulfurization processes of these two units; generally, the dry gas is first desulfurized of hydrogen sulfide using MDEA solvent before being sent to the gas pipeline network or to the hydrogen production facility. After hydrogen sulfide removal using a liquefied gas solvent, desulfurization of alcohols is carried out, followed by distillation. Coking liquefied gas has a lower olefin content and slightly higher total sulfur content.

The key difference is that the coking unit’s dry gas and liquefied gas contain high levels of coke dust, so a sieve tray tower is the best choice for desulfurization. It doesn’t matter whether it’s dry gas or liquefied gas in the catalytic unit.

But the dry gas liquefied gas from the catalytic unit also contains a relatively large amount of catalyst, right?

If I use a mixture of catalytic dry gas and coking dry gas to produce hydrogen, are there any special requirements in terms of the process?

The dry gas from coking units tends to contain liquid and has a high content of coke powder, which significantly affects the operation of the desulfurization tower and can easily lead to tower flooding.

If coking is well controlled, no coke dust will be produced, and hydrogen production is relatively better; the coking dry gas is an excellent raw material for hydrogen production

We are also working on the dry gas unit; we learned * about it today. Thank you. I didn’t expect the catalyzed dry gas to be part of such a process. It seems different from ours

There’s very little catalyst in gasoline used in catalysis; where could there be any in liquefied gas? ? There are too many catalysts; can the pneumatic machine handle it?

What is the difference between sulfur removal from dry gas and liquefied gas in catalytic units, and sulfur removal from dry gas and liquefied gas in coking units? Answer: The process flow is basically the same. Catalytic dry gas desulfurization takes into account the CO2 factor, while coker liquefied gas desulfurization considers the impact of coke dust. What are the differences between the dry gas and liquefied gas of the two sets of equipment? Answer: Due to the different reaction mechanisms of the two processes, the properties of their dry gas and liquefied gas also differ. Catalytic dry gas contains a high amount of H2, CO2, and inert gases ； Catalytic liquefied gas contains a high amount of olefins. Coking dry gas contains a high amount of CH4, little olefins, and almost no H2, CO2, or inert gases, making it an excellent raw material for hydrogen production. Coking liquefied gas has a low olefin content, making it unsuitable for use in gas separation units; it can generally only be used as a domestic fuel.

The desulfurization methods are the same; the sulfur content in catalytic dry gas and liquefied gas is much lower than that in coking dry gas and liquefied gas. The desulfurization process involves first using MDEA amine washing, followed by conventional alkali washing, fixed-bed adsorption for deodorization, or fiber membrane desulfurization techniques for further purification. Due to differences in sulfur content, desulfurization of coker dry gas and liquefied gas is relatively more difficult, and the amount of alkali required is also higher